This is for you YM2500 owners. does anyone know the exact thread pattern for the water temp sender? I thought it was 16 M X 1.5 but that won't fit. could it be 16 MX1.25? I am trying to fashion a gauge/temp unit and have everything but the adapter for the 1/8 NPT sender. I bought one from a guy named Scott somebody, but it is too big (won't fit). any help, please. thanks so much and Happy Holidays and Merry Christmas.
Yanmar YM2500
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BruceR
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You might ask over in the Yanmar section.
Bruce
Bruce
chriswheeler
Platinum Member
The addapter came in the metric addapter kit that I bought with the gages. If you go to a Napa store that stocks gages, they should have the kit as well, not much cost.
Chris
Chris
California
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Here's an old thread with the Sunpro # for the kit that has fit most Yanmars. He said it was 16 M X 1.5.tmar04 said:
http://www.tractorbynet.com/forums/yanmar/34144-ym2000-questions-new-owner.html#post385422
boonesmith
New member
The thread is probably British Pipe Thread Tapered. This thread is used on some of the Japanese autos. You can get the adapters from McMaster-Carr, a large hardware supply. Their website is McMaster-Carr.
I recently used their adapters to put guages on a YM1500D
I recently used their adapters to put guages on a YM1500D
Underwaterdog
Bronze Member
Look on page 3 of the MCM online catalog. It gives instructions and drawings on how to determine what type of thread you have. Copied from page 3 of MCM catalog:
"While NPT threads are common in the United States, BSP threads are widely used in many other countries.
There are two types of BSP threads: BSPT (British Standard Pipe Taper) and BSPP (British Standard Pipe Parallel). Both styles have the same thread angle, shape, and pitch (threads per inch), however, BSPT threads are tapered and BSPP threads are straight (parallel).
NPT and BSP threads are not compatible due to the differences in their threads. NPT threads are set at a 60ｰ angle and have flattened peaks and valleys; BSP threads are set at a 55ｰ angle and have rounded peaks and valleys.
Most NPT and BSP threads also have different pitches (threads per inch), which are listed below. To determine pitch, either count the number of threads that fall into a 1" span or use a thread gauge for a precise measurement."
Maybe this will help you figure out the thread, since it doesn't seem to be metric. I looked in my paper catalog and online and do not see any adapter bushings, but there are plenty adapter nipples. You could use a close adapter nipple. Once its NPT then you can use a standard NPT female x female reducing bushing. I got one of those adapters from Scott for my 3110d, but sadly haven't had time to even see if it fits.
Boonesmith, is this how you did it or did you find an adapter bushing? If so, what is the part number?
"While NPT threads are common in the United States, BSP threads are widely used in many other countries.
There are two types of BSP threads: BSPT (British Standard Pipe Taper) and BSPP (British Standard Pipe Parallel). Both styles have the same thread angle, shape, and pitch (threads per inch), however, BSPT threads are tapered and BSPP threads are straight (parallel).
NPT and BSP threads are not compatible due to the differences in their threads. NPT threads are set at a 60ｰ angle and have flattened peaks and valleys; BSP threads are set at a 55ｰ angle and have rounded peaks and valleys.
Most NPT and BSP threads also have different pitches (threads per inch), which are listed below. To determine pitch, either count the number of threads that fall into a 1" span or use a thread gauge for a precise measurement."
Maybe this will help you figure out the thread, since it doesn't seem to be metric. I looked in my paper catalog and online and do not see any adapter bushings, but there are plenty adapter nipples. You could use a close adapter nipple. Once its NPT then you can use a standard NPT female x female reducing bushing. I got one of those adapters from Scott for my 3110d, but sadly haven't had time to even see if it fits.
Boonesmith, is this how you did it or did you find an adapter bushing? If so, what is the part number?
Gizmo36
Platinum Member
I put one on my 3110D .Got all my stuff from Advance I will see if I still have the paper work on it if you want it.
boonesmith
New member
Underwaterdog,
You are correct. I used a nipple with 1/8 BSPT on one end and 1/8 NPT on the other. I used an NPT "tee" on the end of the nipple to preserve the sending unit and dash light function.
The thread was 1/8 BSPT for the YM1500D, however, I am not sure if Yanmar uses this thread on all models.
You are correct. I used a nipple with 1/8 BSPT on one end and 1/8 NPT on the other. I used an NPT "tee" on the end of the nipple to preserve the sending unit and dash light function.
The thread was 1/8 BSPT for the YM1500D, however, I am not sure if Yanmar uses this thread on all models.
Underwaterdog
Bronze Member
Boonesmith,
so if the light sending unit was originaly BSPT, did the light sending unit screw into the NPT T or did you replace it with a NPT sending unit? The 1500 must be different, because 1/8" NPT pipe is about .405" OD, which is about 10mm. Could it be that tmar04's sending unit was actually tapped
3/8" BSPT, but was close enough to 16mm that it worked after he chased it? 16mm is .6304". 3/8" pipe od is .675.
If the threads are close it might just work.
Just need to know because that is on my list of things to do, and I hate to loose the light, you know, for my wife.
so if the light sending unit was originaly BSPT, did the light sending unit screw into the NPT T or did you replace it with a NPT sending unit? The 1500 must be different, because 1/8" NPT pipe is about .405" OD, which is about 10mm. Could it be that tmar04's sending unit was actually tapped
3/8" BSPT, but was close enough to 16mm that it worked after he chased it? 16mm is .6304". 3/8" pipe od is .675.
If the threads are close it might just work.
Just need to know because that is on my list of things to do, and I hate to loose the light, you know, for my wife.
boonesmith
New member
Sorry, I had forgotten about the sending unit "incident" until you asked the question.
I went from the nipple to a 1/8 NPT tee. I made up the assembly without remembering that the sending unit should have been 1/8 BSPT. The sending unit was new and I never checked the threads.
I decided to leave things as they were since I had probably damaged the threads on the sending unit, the tee, or both and the connections did not leak. I should have used a 1/8 BSPT tee with a 1/8 NPT adapter to the copper line running to the guage.
I will send some photos tomorrow. I used a quick and easy(lazy) way of mounting the gauges. I mounted the set to the steering column tube using a "U" bolt and an adapter/spacer.
I went from the nipple to a 1/8 NPT tee. I made up the assembly without remembering that the sending unit should have been 1/8 BSPT. The sending unit was new and I never checked the threads.
I decided to leave things as they were since I had probably damaged the threads on the sending unit, the tee, or both and the connections did not leak. I should have used a 1/8 BSPT tee with a 1/8 NPT adapter to the copper line running to the guage.
I will send some photos tomorrow. I used a quick and easy(lazy) way of mounting the gauges. I mounted the set to the steering column tube using a "U" bolt and an adapter/spacer.
California
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Just to clarify here: The water temp sender and the oil pressure sender have different threads.
16 mm X 1.5 is when we're talking about the water sender. You can't 'T' it because the sensors won't both be in hot water.
1/8 BSPT (British Standard Pipe Thread) is similar enough to 1/8 NPT ([American] National Pipe Thread) that they can be jammed together - sometimes. On Yanmar that's the thread for the oil pressure sender. A T works fine, pressure is equal in all parts of the pressurized system, you can have both a gauge and a warning light.
I think.
16 mm X 1.5 is when we're talking about the water sender. You can't 'T' it because the sensors won't both be in hot water.
1/8 BSPT (British Standard Pipe Thread) is similar enough to 1/8 NPT ([American] National Pipe Thread) that they can be jammed together - sometimes. On Yanmar that's the thread for the oil pressure sender. A T works fine, pressure is equal in all parts of the pressurized system, you can have both a gauge and a warning light.
I think.
Underwaterdog
Bronze Member
I understand this, we started out talking about the engine coolant temp sensor. Did you mean you used the tee on the OPS? Is this because of the possibility of air in the tee, or because the sensor is not inside the block, reading the actually temperature of the water because it is not reading the temperature of the water in the block? If it is air, you could loosen the fitting and bleed the air out of it. I read somewhere that water transfers heat something like 24 times as effectively as air. However, I also know that there could be a substantial temperature difference at the T even if there is no air in the line. I wonder if you could insulate the tee with an industrial grade fiberglass tape and mastic and significantly reduce the temperature drop. I'm talking about the kind that is used on steam lines, not the hardware store variety for insulating potable water lines that will disintegrate at high temperature. I have a gallon out in the shop and can get the info off of the bucket if necessary.
California
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For me, neither tee.
After I bought the tractor I did the research on adapters and bought a temp gauge, with its own sender and the correct adapter.
Then I learned the importance of flushing chaff out of the radiator when mowing. I've never seen my temp light on since. I concluded a temp gauge was not needed.
I didn't see any way to expose the new sensor for the gauge, and the old sensor for the light, to hot water at the same time. Reading here in the Yanmar forum convinced me it was impossible.
Also reading here I've seen several owners add an oil pressure gauge and still have the oil light, by using a tee and BSPT/NPT adapters.
That's all I meant to describe. Sorry if I wasn't clear.
After I bought the tractor I did the research on adapters and bought a temp gauge, with its own sender and the correct adapter.
Then I learned the importance of flushing chaff out of the radiator when mowing. I've never seen my temp light on since. I concluded a temp gauge was not needed.
I didn't see any way to expose the new sensor for the gauge, and the old sensor for the light, to hot water at the same time. Reading here in the Yanmar forum convinced me it was impossible.
Also reading here I've seen several owners add an oil pressure gauge and still have the oil light, by using a tee and BSPT/NPT adapters.
That's all I meant to describe. Sorry if I wasn't clear.
Another way to install a temp gauge is to mount the sensor in the radiator hose. There are several sellers on EBay that sell couplers for that purpose. You just install the coupler inline on the radiator hose, then screw the temp sensor into the coupler. Very easy to install and you don't have to worry about thread sizes and clearance issues. Hope this helps
